I, too, have broken 2 1/8" spiral bits. I have several different MilesCraft Spirocrafter sets and I wanted to know what bushing sizes to use with what size bit to make inlays. They wrote back with this guidance:
If you use a 1/8" bit, then the size of the bushings should be two (2) times the diameter of the bit. Therefore, 1/8" bit usesbushings 1/4" difference, eg., 1/4" bushing to make the inlay-pocket, and 1/2" bushing to cut the inlay material. Or, 3/8" bushing for the pocket, and 5/8" bushing for the inlay material.
Can anyone help a math-deficient person to figure out what size bushings I should use if I use a 1/4" bit? 1/2" bit?
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